package com.webserver.core;

import com.webserver.http.HttpRequest;

import java.io.*;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;

/**
 * 处理与指定客户端的HTTP交互
 * HTTP交互采取一问一答，因此这里分为三步完成一次交互过程：
 * 1：解析请求
 * 2：处理请求
 * 3：响应客户端
 */
public class ClientHandler implements Runnable{
    private Socket socket;
    public ClientHandler(Socket socket){
        this.socket=socket;
    }
    public void run() {

        try {
            //1解析请求
            HttpRequest request =new HttpRequest(socket);


            //2：处理请求
            //通过请求对象获取浏览器url中的抽象路径部分
            /**
             * http://localhost:8088/myweb/index.html
             * http://localhost:8088/myweb/classTable.html
             */
            String path =request.getUri();
            File file =new File("./webapps"+path);

            //3：发送响应

            /**
             * 发送一个标准的响应大致如下：
             * HTTP/1.1 200 OK(CRLF)
             * Content-Type： text/html（CRLF）
             * Content- Length： 2546（CRLF）（CRLF）
             * 10111010101010101.....
             */
            OutputStream out =socket.getOutputStream();
            //3.1:发送状态行
            String line ="HTTP/1.1 200 OK";
            byte[] data =line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13);
            out.write(10);
            //3.2:发送响应头
           line ="Content-Type: text/html";
           data =line.getBytes("ISO8859-1");
           out.write(data);
           out.write(13);
           out.write(10);

            line ="Content-Length: "+file.length();
            data=line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13);
            out.write(10);
            //单独发送CRLF表示发送响应头发送完毕
            out.write(13);//write CR
            out.write(10);//write LF
            //3.3:发送正文（index页面内容）
            FileInputStream fis =new FileInputStream(file);
            byte[] buf =new byte[1024*8];
            int len;
            while((len=fis.read(buf))!=-1){
                out.write(buf,0,len);
            }

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                //交互完毕后与客户端断开连接
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}
